[STM32F4] stm32 TIM 输出比较

void TIM4_LED_Config(void)

{

  TIM_OCInitTypeDef  TIM_OCInitStructure;

  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;

  NVIC_InitTypeDef NVIC_InitStructure;

  uint16_t prescalervalue = 0;

  

  /* TIM4 clock enable */

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);

  

  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

  

  /* Enable the TIM3 gloabal Interrupt */

  NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;

  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;

  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

  NVIC_Init(&NVIC_InitStructure);



  /* Initialize Leds mounted on STM324F4-EVAL board */

  STM_EVAL_LEDInit(LED3);

  STM_EVAL_LEDInit(LED4);

        STM_EVAL_LEDInit(LED5);

  STM_EVAL_LEDInit(LED6);

  

  /* Compute the prescaler value */

  prescalervalue = (uint16_t) ((SystemCoreClock ) / 50000) - 1;

  

  /* Time base configuration */

  TIM_TimeBaseStructure.TIM_Period = 65535;          

  TIM_TimeBaseStructure.TIM_Prescaler = prescalervalue;

  TIM_TimeBaseStructure.TIM_ClockDivision = 0;

  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

  TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);

  

  /* Enable TIM4 Preload register on ARR */

  TIM_ARRPreloadConfig(TIM4, ENABLE);

  

  /* TIM PWM1 Mode configuration: Channel */

  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Timing;

  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;

  TIM_OCInitStructure.TIM_Pulse = CCR_Val;

  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

  

  /* Output Compare PWM1 Mode configuration: Channel2 */

  TIM_OC1Init(TIM4, &TIM_OCInitStructure);

  TIM_OC1PreloadConfig(TIM4, TIM_OCPreload_Disable);

    

  /* TIM Interrupts enable */

  TIM_ITConfig(TIM4, TIM_IT_CC1 , ENABLE);

  

  /* TIM4 enable counter */

  TIM_Cmd(TIM4, ENABLE);



}

void TIM4_IRQHandler(void)

{

 

  /* Checks whether the TIM interrupt has occurred */

  if (TIM_GetITStatus(TIM4, TIM_IT_CC1) != RESET)

  {

    TIM_ClearITPendingBit(TIM4, TIM_IT_CC1);

    if( LED_Toggle == 3)

    {

      /* LED3 Orange toggling */

      STM_EVAL_LEDToggle(LED3);

      STM_EVAL_LEDOff(LED6);

      STM_EVAL_LEDOff(LED4);

    }

    else if( LED_Toggle == 4)

    {

      /* LED4 Green toggling */

      STM_EVAL_LEDToggle(LED4);

      STM_EVAL_LEDOff(LED6);

      STM_EVAL_LEDOff(LED3);

    }

    else if( LED_Toggle == 6)

    {

      /* LED6 Blue toggling */

      STM_EVAL_LEDOff(LED3);

      STM_EVAL_LEDOff(LED4);

      STM_EVAL_LEDToggle(LED6);

    }

    else if (LED_Toggle ==0)

    {

      /* LED6 Blue On to signal Pause */

      STM_EVAL_LEDOn(LED6);

    }

    else if (LED_Toggle == 7)

    {

      /* LED4 toggling with frequency = 439.4 Hz */

      STM_EVAL_LEDOff(LED3);

      STM_EVAL_LEDOff(LED4);

      STM_EVAL_LEDOff(LED5);

      STM_EVAL_LEDOff(LED6);

    }

    capture = TIM_GetCapture1(TIM4);

    TIM_SetCompare1(TIM4, capture + CCR_Val);

  }

}